#list=[1,2,3,2]
#a=list[0]
#for i in list:
    #if i>a:
        #a=i
#print(a)
#list2 = [1,2,3,4,'a',1]
#sum = 0
#for i in list2:
#  if isinstance(i,int):
#       sum = sum + i
#print(sum)
#x = 6
#for i in range(2,x):
#   if x % i == 0:
#        print("不是素数")
#        break
#else:
#    print("是素数")
x = 5
sum = 0
for i in range(2,x+1):
    for j in range(2,i):
        if i % j == 0:
            break
    else:
        sum = sum + 1
print(sum)